Java Requires Chilkat v11.7.0+

Replace the Second (or Every) Occurrence of a Label in a PDF

See more PDF Text Replacement Examples

Demonstrates the "occurrence" member of a label entry. By default the first occurrence of a label, in reading order across the selected pages, is replaced; "occurrence" can be a number for the nth, or "all" for every occurrence. The invoice template has "Ref:" twice. Chilkat2 Java

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.JsonObject;
import com.chilkatsoft.chilkat2.Pdf;

public class ChilkatExample {

    public static void main(String[] args) {
        // This example requires the Chilkat API to have been previously unlocked.
        // See Global Unlock Sample for sample code.

        // The PDF used in this example is available at invoice_template.pdf

        Pdf pdf = new Pdf();
        try {
            pdf.loadFile("qa_data/pdf/invoice_template.pdf");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        JsonObject json = new JsonObject();
        JsonObject jsonOut = new JsonObject();

        // This template's {{placeholders}} are not being filled here: "keep" leaves them as they are
        // (the default, "error", would refuse to apply while a placeholder on the page has no value).
        json.updateString("unusedPlaceholders", "keep");

        // "Ref:" appears twice on the page (A-1 near the top, A-2 below the totals).
        // The default replaces the first occurrence only.
        json.updateString("labels[0].label", "Ref:");
        json.updateString("labels[0].value", "B-7");
        try {
            pdf.textReplace("check", json, jsonOut);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        System.out.println("default: " + jsonOut.intOf("replacements[0].count") + " occurrence replaced");

        // The second occurrence only.
        json.updateString("labels[0].occurrence", "2");
        try {
            pdf.textReplace("check", json, jsonOut);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        System.out.println("occurrence 2: " + jsonOut.intOf("replacements[0].count") + " occurrence replaced");

        // Every occurrence.
        json.updateString("labels[0].occurrence", "all");
        try {
            pdf.textReplace("apply", json, jsonOut);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        System.out.println("occurrence all: " + jsonOut.intOf("replacements[0].count") + " occurrences replaced");

        try {
            pdf.writeFile("qa_output/invoice_refs.pdf");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Sample output:

        // default: 1 occurrence replaced
        // occurrence 2: 1 occurrence replaced
        // occurrence all: 2 occurrences replaced
    }
}